Composer找不到配置文件

我想通过作曲家创建一个laravel项目。我尝试运行：

I want to create a laravel project by composer. I try to run this:

composer create-project laravel/laravel c:/laravel --prefer-dist

有一个错误：

  [InvalidArgumentException]
  Composer could not find the config file: C:\ProgramData\ComposerSetup\bin
  To initialize a project, please create a composer.json file as described in
   the http://getcomposer.org/ "Getting Started" section

作曲家.json文件是：

The composer.json file is:

{
    "require": {
        "laravel/laravel": "4.2.0"
    }
}

cygwin。
我的计算机上还有一个代理，所以我将HTTP_PROXY_REQUEST_FULLURI和HTTPS_PROXY_REQUEST_FULLURI的路径设置为0和false

I am using windows 8 and use cygwin. I also have a proxy on my computer so I set the path of HTTP_PROXY_REQUEST_FULLURI and HTTPS_PROXY_REQUEST_FULLURI to 0 and false

任何想法？